PROTECTIVE ANTI-TRAWL FRAME WITH EXTENSION RODS WITH SUPPORT-FIXING MECHANISM Russian patent published in 2020 - IPC E21B33/37 

FIELD: oil and gas industry.

SUBSTANCE: disclosed is a protective anti-trawl frame with extensions with a support-locking mechanism, comprising a protective housing, telescopic extensions, support-fixing mechanisms. Each of the extensions is arranged between the inner surface of the support housing and the outer surface of the housing of the telescopic extension and comprises a separator, wherein the said bulge has a plurality of longitudinal channels. On the external surface of the body of the telescopic extension piece there is a bushing containing a plurality of longitudinal channels corresponding to the plurality of longitudinal channels of the separator, a plurality of axial elements and a plurality of springs, and a plurality of circular rows of balls arranged in the recesses made along the perimeter of the divider so as to form a protruding part, each of the balls being rotatable in the recess. Each axial element comprises a transverse bulge and is configured to be placed in a longitudinal channel of the separator and a longitudinal channel of the bushing corresponding thereto to form a cavity in the extension of the longitudinal bore of the bushing. And each of the plurality of springs can be arranged in the above cavity around the corresponding to it axial element and engagement by its endings for transverse thickening of the axial element on one side and separator on the other. On the inner surface of the support housing there is a holder to form a plurality of circular grooves corresponding to circular rows of balls between the holder and the separator. Each of the circular grooves is formed by a skew made in the inner surface of the holder. Separator together with balls is made with possibility of displacement from position, in which during extension of telescopic extender from support due to abutment of separator to sleeve and compression of springs is provided adhesion of balls to housing of telescopic extension and holder, in a position, in which, when the telescopic extender is moved back into the support by releasing the springs and moving the balls over the chamfer of the holder, they are pressed into the body of the telescopic extension and engage with said body.

EFFECT: invention can be used to protect underwater column heads from mechanical action of falling objects and passing trawl.

7 cl, 8 dwg